| Fact Group (Combination of Network and Hypercube) | |
| Network: | 105102 - Statement - Statement of Operations, Earnings Per Share (http://www.abc.com/role/StatementOfOperationsEarningsPerShare) |
| Hypercube: | Earnings Per Share [Table] (abc:EarningsPerShareTable) |
| brm:ConceptMeasure | brm:ReportingEntityMeasure | brm:CalendarTimeMeasure | us-gaap:CreationDateAxis | dei:LegalEntityAxis | FactValue | brm:Units | brm:Rounding |
| us-gaap:EarningsPerShareBasic | 0000000001 (http://www.sec.gov/CIK) | 2010-01-01/2010-12-31 | abc:AsReportedFebruary122011Member | dei:EntityDomain | 1.00 | iso4217:USD xbrli:shares | 2 |
| us-gaap:EarningsPerShareBasic | 0000000001 (http://www.sec.gov/CIK) | 2009-01-01/2009-12-31 | abc:AsReportedFebruary122011Member | dei:EntityDomain | 1.00 | iso4217:USD xbrli:shares | 2 |